This little bracket provides an easy way to mount a PCB vertically. It includes a small wire clamp that can be used to hold PCB wires in place. I use it to hold a small 1" x 0.5" PCB that has a bank of header pins for X, Y, Z, and E motors. (See photo.)

Set User-defined values, render, and print. Insert the PCB in the channel and route the wires between the mounting holes. Place the wire clamp on top and mount using the holes. You may need to tweak the values a bit for a snug fit.